Shape optimisation of a biaxially loaded cruciform specimen

In the present study, the shape of a cruciform type specimen under biaxial loading conditions is optimised. The basic goal is to achieve uniform biaxial failure in the centre of the specimen and minimise undesirable phenomena, such as premature failure outside the area of interest and non uniformiti...

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Bibliographic Details
Published in:Polymer testing 2010-04, Vol.29 (2), p.216-223
Main Authors: Makris, A., Vandenbergh, T., Ramault, C., Van Hemelrijck, D., Lamkanfi, E., Van Paepegem, W.
Format: Article
Language:English
Subjects:
Applied sciences
Biaxial loading
Cruciform type specimen
Exact sciences and technology
Failure
Finite element method
Finite element model (FEM)
Forms of application and semi-finished materials
Laminates
Mathematical analysis
Mathematical models
Optimization
Polymer industry, paints, wood
Quadratic programming
Sequential quadratic optimisation (SQP)
Strain
Stress concentration
Technology of polymers
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Summary:In the present study, the shape of a cruciform type specimen under biaxial loading conditions is optimised. The basic goal is to achieve uniform biaxial failure in the centre of the specimen and minimise undesirable phenomena, such as premature failure outside the area of interest and non uniformities on the central strain field, caused by stress concentrations. A numerical optimisation technique (sequential quadratic programming or SQP) is coupled with a parametrically built finite element model (FEM) to concentrate and initiate damage in the centre and achieve a uniform strain field by varying the geometrical characteristics of the specimen. The outputs of the optimisation process are compared with a commonly used cruciform type geometry.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2009.11.004